Go back to 708 and make up some excuse.

Damn. It figures this would happen. Oh well, she'll come back. And if not, she'll probably leave a room number or her extension. You really want to smoke some pot. It'll take the edge off. Besides these guys seem cool. It'd be nice to make some friends. Maybe later, you all can go find something to do... Grab some beers or food, meet some girls...
You walk back into their room.
"Sorry man, I can't find the slide for the bong. It's packed away somewhere in my shit. Besides, my roomate's parents are there and I probably shouldn't break out the bong anyway," you tell Loki.
"Fuck it, we'll use this. No big deal. Damn, I hate this episode. The Simpsons musical, what the hell is that," he mumbles as he packs the bowl. He finishes and hands it to you.
"Thanks," you see and pull deeply on the bowl. It's pretty good bud and you fight off the urge to cough. You don't want to seem like a pussy do you? You pass it back to Loki, he hits it, then hands it to Brian. When Brian's done, he hands it to you. What happened to Mike?
You take it and look at Loki and make a gesture to Mike.
"Nah, he doesn't smoke, he just sits there and fucks around with the computer," Brian informs you.
Mike turns bright red but says nothing. Oh well, the three of you finish the bowl and another. You're pretty stoned now and want to go grab something to drink.
"Thanks for the herb. I'm going to find a soda machine. I live in 710, why don't you guys stop by later. We'll go find a party, start some trouble, whatever..." you say as you get up from the couch.
"Sounds like a plan," Loki says.
You say goodbye to them and leave.