Cw: AFAB Reader, Office Sex, Unprotected Sex, MINIMAL Plot, Dia calls Reader "Princess", Handjob (AFAB Receiving), Oral Sex (AFAB Receiving), Hittin' it from behind, Creampie
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Barbatos guided you to the prince's office. Diavolo had texted you to come over and quickly ordered Barbatos to fetch you after you agreed. You fidgeted with your fingers as the demon escorted you; you were silently praying that he didn't know the dirty things his master texted you mere moments ago.
You and Diavolo had started seeing each other a few months into the transfer program. The brothers were none the wiser, not even Lucifer knew. However, Barbatos was a big mystery. You hid the secret well, but has Diavolo? Would Barbatos even tell you if he knew?
Barbatos stopped in front of the large door to Diavolo's office. He knocked. "My lord, Y/N is here."
Barbatos opened the door just enough to let you in and swiftly closed it behind you. Diavolo sat at his desk with a grin.
"Come here, princess." He spoke, pushing his chair away from his desk. As you approached, his hand pat his thigh, signaling for you to sit on his lap. You straddled him and slinked your arms around him. His golden eyes studied you. Every time you spent these moments together, he became even more enamored by you. He never thought the transfer program would lead to the prince finding such an enchanting human.
His large hands rested at your hips as you ran your fingers through his hair. You giggled after noticing his loving gaze.
"What's with that look?"
His hand gently squeezed you. "You're so beautiful." He brought you closer to kiss your cheek. "I don't deserve you~"
He began to kiss your neck, nuzzling into you as you replied with your hand on the back of his head. "Don't say that. If anything, I don't deserve you. You're literally royalty."
He left your neck to cup your cheek. "My status has nothing to do with this. I'm not the one who made pacts with the seven strongest rulers in the Devildom. I'm not the one who has natural charm. You've managed to become friends with the strangest of people. You have a gift, my dear."
He guided you down into a kiss. You melted into him as one of his hands moved up your back, holding you close. Your hand tugged at his red hair as you deepened the kiss. Diavolo groaned, his own hand trailing down to rest on your ass. You parted from his lips to nip at his neck. Your hands trickled down his chest while his larger ones went under your shirt, blisteringly hot palms became stagnant on your back.
You rose from his neck and hungrily kissed him again. Before long, Diavolo's grip on you tightened, picking you up with ease. He stood and gently placed you on your back onto the desk in front of him. This time, he ended the kiss, slowly pushing your shirt higher to expose your bra. He cupped your breast as he trailed kisses down from your cheek, your neck, to your stomach. He slid your bottoms down to kiss your thigh, his hand cupping your clothed pussy. He slowly teased you as his glittering eyes met your face, enjoying the tiny sounds you made and the pleading look on your face.
His fingers hooked the band of your underwear and pulled them down. Diavolo grabbed you by the hips to pull you closer to him. He placed a soft kiss to your clit, studying your expression before kitten-licking the nub. Your leg draped over his shoulder as his tongue slowly dived into you. You always tasted so sweet - so enticing - to him. He will never get enough.
He sucked at your arousal like he was in love with you. Maybe he was, you didn't know. He was always so gentle with your body, but it never failed to leave both of you satisfied and willing for more.
With a final, sticky kiss to your clit, Diavolo stood to tower over you. He kissed your upper lips again, thumb rubbing your cheek softly. He rested forehead against yours with a smile.
"Always such a good human for me~" He cooed. You returned his grin and tugged at his shirt.
"Please take me, Dia." You whispered.
"Anything for you, darling." He pecked your forehead before getting off of you, undoing his belt. His gaze momentarily shifted to you. "I want you ass up, princess."
You hastily slid into position while he freed his erection. Your feet were planted on the ground as Diavolo eased into you. He was huge, that was a given, but he always did everything he could to make sure he never hurt you. He moaned out a low "fuck" after he was fully in. If your R.A.D. profile didn't say otherwise, the prince would have sworn that you were an angel. You always felt like heaven.
Diavolo's larger hand covered your splayed out one on the desk. His fingers curled in between yours to hold your hand before he began to shallowly thrust into you. Your skin smacked together as he gradually quickened his pace. The tip of his cock hit deep inside you as you moaned, tightening around him.
He never let go of your hand, his free one resting on your stomach as he fucked you. Your legs were beginning to feel weak. It was becoming hard to stay standing as your other hand tightly gripped the desk, nails digging into the wood. The hand on your stomach slid down to play with your clit. You moaned loudly, trying to keep your legs from giving out. Your upper body felt heavy as you put your full weight onto the desk.
"Dia...Babe!" You cried out before you felt a burning pleasure wash through you in waves. You whined as Diavolo's hand moved from your clit to your hips. You slowly came down from your orgasm as he thrusted a few more times, finally spilling into you with a husky groan.
The two of you panted as you both stilled. The hand that was gripping the desk came up to rest beside your head. Diavolo finally let go of your other one to carefully pull out of you, staying close by in case your legs gave out.
He bounced back quicker than you, pulling out a few tissues from a desk drawer. He silently cleaned your bodies while you regained your strength. Diavolo was fixing his clothing when you finally hauled yourself off of the desk, holding onto the edge to stabilize yourself. The demon prince smirked and gently pecked your head.
