Invite him to hang out with you.

You can't imagine having any fun at Mark's place, and your family is probably the worst place to turn to maintain Mark's innocence. You decide your dorm is the best option.

"Hey, would you like to hang out with me this weekend? My roommate is gone, and you can crash on his bed. I'll show you some sights and introduce you to a few people." You don't say it, but in your mind you also utter the words, "and you can walk around all day in your underwear, if you want."

Mark's face lights up. "Oh, man! That would be great! I really wasn't looking forward to spending all that time by myself. Are you sure I wouldn't be putting you out?"

You resist the urge to say, "Dude, I'd put out for you in a heartbeat," and instead say, "Not at all! I was looking for someone to do, anyway. I mean -- SOMETHING to do...." Whoops. The filter missed that one.

Mark doesn't seem to pick up on the slip and instead leans back in the seat with a sigh. "This is great! I don't know how to thank you!"

You bite your tongue. With the filter not working at full capacity, there's no telling what would come out of your mouth. Although, as you steal a glance at Mark's crotch, you have a good idea of what you would like to have IN your mouth.

Refocusing, you change your route to take you back to campus. "So we'll take your things to my room, and then what would you like to do?"

"What are my options?"

"Well, pretty much the sky is the limit... We could hang out for a bit if you need to rest from your flight, go catch a movie, meet some people, play naked Twister...." Whoops... Another slip.

Mark laughs nervously and blushes. "WHAT kind of Twister?"

"Forget it... Just a joke." That much was true. You really are much more into naked volleyball and nude mud wrestling.

Mark thinks for a moment and says, "Man, I don't know. This is so much different than what I'm used to. You know this place better than I do. Why don't you choose?"