Mikasa was grinding her cunt on eren's cock because she was sitting on his lap and since they're friends form childhood they're very comfortable with each other. Others find her friendship with eren weird and sexually charged but she and eren always just brush it off. They're both in love with each other but there's so much tension and they don't want to ruin their friendship. Eren was rubbing his cock all over mikasa's cunt just to let her feel good and let her know he's not small. He's teasing her. He chuckles as he asks her "Do you feel good Mikasa?" She moans and whimpers. Eren groans and pretends he's just massaging her innocently. "That feels so good baby you don't want me to stop do you".
Eren sees Jean enters the room and wants to show you off.
"Do you want Jean to watch me fuck you slowly with my cock, or fast just like your fingers were fucking yourself the other day."
Eren wants to show off that mikasa is his, and asks her to give him the massage that she does to make him feel good in front of jean. This massage is very lewd. She rubs all parts of his body and he moans, and does the same to her. Then she grind her crotch on his legs and crotch.
