Yes, go upstairs with Mark

You join the guys headed upstairs and they split off into the different dorm rooms to play the network game. You join Mark in his room and grab a controller. He closes the door behind him. You sit down to play the game. It is a zombie shooter game with gory graphics and a funny story line. You laugh and talk with your new friend, Mark, while playing.

After a few minutes you notice Mark is staring at you. You try not to make a big deal of it but it makes you feel a bit strange. You look over and notice his eyes directed to your crotch. He looks up and blushes a bit. You look down and see his pants tented with an erection. Mark keeps staring at you, looking into your eyes for a long time. He bites his lip and shyly asks: