In The Lecture Hall...

"Hello, sensei~" said Sherlock with a smirk as he got up from his seat.

"Mr Holmes..." William said with a surprised face.(but we all know we cant see it clearly)

"Did i passed your test?" Asked Sherlock

"...you took the test along side my students?" William guessed

"hehe" sherlock chuckled

" i wish to discuss with you about something, Liam. Thats the whole reason i came here..." said Sherlock

"...and to fulfilled the promised you made about having dinner with me," Sherlock continue with a smirk.

" i remember no such promise" William looked away while saying that.

"Aww, come on Liam," Shelock pleads 

"hmm, how about lunch instead? i can mark the exam papers in the meantime," William suggested

"deal~" said Sherlock. However, his expression is saying he's up to no good

"what shall we have for lunch?" William asked as he was about to open the door

Suddenly, someone came from the back and slam the door. William felt the breath of another person from his neck and turn around. There was Sherlock.

'too close-' William thought

 " i want you said Sherlock as he close the little gap between him and William

"what are you-" William was about to say something but his lips was covered by another.

William was shock. He tried to resist but fail as Sherlock deepen the kiss with his tongue.

As they kiss, Sherlock wrap his arms around William's waist. William gave in and proceed to place his arms around Sherlock's neck.

After a few minutes, they let go of each other to catch their breath.

"What do you think you're doing, Mr Holmes?" William asked sternly. But, his arms still remains on Sherlock's neck.

"i'm having my lunch, Liam~" as Sherlock said that, his sneaky hand went to unbutton William's blazer and Sherlock proceed to untie William's tie

"we cant- not in broad daylight-" William tried to resist. However, Sherlock continues to kiss and bite his neck.

"Aaah~" William moans

William can no longer resist. He knows that Sherlock isn't going to stop. Might as well go along with it.

After that, Sherlock unzip William's pants

"wait! no- not at the door..." William said shyly

Sherlock realise they were still at the door. Then, he quickly lock the door and carried William. Princess style.

"eh- put me down!" William shouted

"if you don't want anyone to know that the professor William James Moriarty is having sex in the lecture room, you better don't shout," Sherlock provokes

William blushed

Sherlock puts William in a sitting position on the teacher's desk. Then, Sherlock proceed to unbutton his own shirt while he kiss William on the lips deeply once more.

After that, Sherlock went down and begin to lick William's nipples.

"Wait- no, Holmes- Aaah~!" William moan, feeling the pleasure he received

Sherlock didn't care. He continue to lick William's nipple until there were red.

"Aaah~ Mmmn~ AAh~!" William kept moaning