Grab some ice for your dick while you think things over

Your throbbing cock is making it difficult to concentrate, so you figure you might as well ice it down for a bit while you think about things. As you're putting ice cubes into a Ziploc bag, though, you're interrupted by a knock on your door. "Who the hell is knocking on the door!?" you say to yourself, stopping your task and moving towards the front of the house. Not sure who it could possibly be, you peak out the window first to see who it is. You're relieved to see your roommate, Dan's, little sister, Megan, standing outside with a friend.

Opening the door, you're greeted by the site of two, beautiful girls. Megan is actually Dan's half-sister from his dad's second marriage and he's ten years older than her. She just turned 18 and finished her senior year of high school. Wearing a t-shirt and short, white shorts, she has straight, shoulder-length, auburn hair and stunning green eyes, with a petite body, standing only 5'2" with B-cup tits.

Her friend looks to be about the same height with slightly larger breasts. She has curly brown hair, brown eyes, and is wearing a sleeveless, argyle shirt, and green, cut-off shorts.

Smiling at her and stepping aside to let her in, you say "Megan, what are you doing here?" Holding out your hand to her friend, you introduce yourself. "Hi, I'm David. Megan's brother's roommate."

"David!" she calls out, jumping onto you and giving you a big hug. Hopping off you she continues. "This is Chrissy, my BFF. We're actually here to ask a huge favor. See, there's this epic party happening tonight and we need stuff to drink. I already texted my brother but he told me he was busy with work. Is he really here and was just lying to me?"

"No, as far as I know, he's taking care of some things at the office, at least that's what his girlfriend said earlier." you tell them, deciding to give them the information that Kylie provided you before all the other excitement happened.

"Well then, do you think you could help me out, pleeaasseee? It's not like Dan wouldn't get it for me if he was around. I have money, you wouldn't even need to pay!"

The gears in your mind begin to spin. You have no problem getting **** for the girls. You know Megan is right and that Dan would get it for them without a second thought and figure that it's all a part of growing up. What you start to question is if you should just buy it, with no strings attached, or if you should try to get something for yourself out of this.