(Diaz Household, Marco's bedroom)
Marco was getting ready to sleep just as Star barged into the room. "Hey, Marco, can I ask you a question?" She asked as she went to the boy.
"What is it, Star?" Marco replied in frustration.
"So, I checked on your parents' laptop and found some peculiar pictures on a peculiar site." Star started, which made Marco flinch in surprise. "These pictures had gigantic dicks, stomach bulges that honestly looked kind of painful, and so much semen that it went right through the whole body and made whoever was getting penetrated barfed it out. My question is, are any of those things realistic?"
Marco sweated a little and gave Star a comforting look before saying, "No, Star, what you saw wasn't realistic."
"Thank goodness, 'cause it freaked the shit out of me." The princess answered with a laugh. "Anyway, along with that question I wanted to ask you... could we do doggy style?"
"What?!"
"Come on, Marco, my curiosity has been peaked!" Star pleaded. "I want to know how it feels in real life!"
And then she leaned closer towards Marco and reached for his johnson, which was throbbing in his pants. "Besides, that thing pushing in your pants seems to agree with me."
Marco looked everywhere as he tried to think of an answer, but he eventually gave in when he saw Star's pleading puppy dog eyes. "Fine, Star, but it won't be pleasant."
"I dated Tom for years, I'm sure I can handle unpleasant stuff."
(One set up later)
Marco, now without pants and with his male pride showing, got ready to put it in Star, who waved her naked butt with a rather seductive look. "Okay, I can't put it in the vagina, you'll end up pregnant if I do. Instead, I'll do your ass." Marco explained as he went to Star and grabbed her butt cheeks. "If it hurts too much, just tell me to pull it out."
"Yeah, right, I got it, now shut up and put it in!" Star demanded.
Angry at the girl's retort, Marco immediately inserted his penis into Star's asshole, with Star reacting with quite a bit of pain. "Okay, I think you put it in a tad too fast." Star remarked with a laugh. "But I'm fine, I'm fine, keep going."
Marco remained still for a moment, and he saw that Star was breathing heavily with a scared look. Not wanting to upset her, though, Marco started thrusting his dick in Star's donkeyhole, and continued doing so as Star moaned in a pleasured way. Then, once he started going faster, Star's pleasure turned into pain as she bit the bed sheets and tried to hold back her tears.
Once Marco was going at his fastest, Star swallowed her pride and shrieked, "Marco, pull it out!"
The boy stopped, did as told and watched as Star cried and collapsed on his bed. Not only that, he also noticed that Star's asshole was bleeding. "I'm sorry that I hurt you, Star." Marco apologized.
"No, Marco, you were just doing what I asked you to do. Then again, I never told you to go faster or anything." Star replied as she tried to get up, only to collapse again. "Hey, can I sleep with you tonight? I can't feel my asshole...or my legs...or my entire lower half, for that matter."
Marco smiled with sympathy and answered, "It's the least I can do."
With that said, Marco helped Star accommodate herself properly, covered each other in the bed sheet together and kissed her forehead as she gave him a smile. Marco returned the smile, and they fell asleep afterwards.