Easy

Your sister and her friends have already proven that they can overpower you, plus with the punishments they already gave you for not cooperating, the easy way is probably the best. Without saying anything you face the wall and lean against it, arching your back so your ass sticks out. You reach behind and hike your skirt up, revealing your panties. You can hear the girls laughing and snapping pictures on their phones the entire time. Finally, you pull your panties down showing them all your freshly-shaven asshole and erect penis.

Lilly chuckles and says, "That's a good girl." You hear her walk over to her bag and pull something out of it. Curiosity gets the better of you and you turn around to look. You see her putting on a 6 inch black strap-on over her yoga pants. Your mouth opens slightly out of shock as you stare at for several seconds, partly out of fear and partly out of wonder. Your sister snaps another picture and says, "This would go really good on my blog!"

Before you can respond to that Lilly starts walking over to you. Since you don't see Lilly much at school you've never gotten a good look at her, but as she approached you started to appreciate her appearance. Lilly was easily a half a foot taller than you and was your sister's only black friend. She straightened her hair and kept it in a ponytail that hung over onto her chest, covering her right breast. She was thicker than your sister and her other friends, but not unattractive. Lilly also had a dominating look in her face, like she could easily make anybody her bitch. She was about to prove this to you first hand.

"Since you're being so willing about this, I'll try to go a little bit easy at first, but after I start getting into it I can't make any promises." Lilly laughed and smacked your ass, leaving a red mark. "Who's got the lube?"

"Here." Amanda hands her a bottle of lube, and she opens it and spread some onto her fingers. "Okay sissy slut, I'm gonna get your hole nice and lubed first so this won't be as hard. Alright sweetie?" She had a condescending tone in her voice, almost like she was talking to a child that scrapped their knee.

She spread some more lube onto your asshole and then slide one of her fingers in. "Have you done this before Marcia? That went it a little easy for the first time." All the girls started to laugh and your cheeks went red again. While you had fingered yourself before, you didn't do it often and mainly did it out of curiosity. She added a second finger and started sliding them in and out slowly, making your erection stiffen even more.

"I want you to beg for this sweetie, beg for my cock."

You shut eyes to muster up the courage, then opened them slightly and in an accidentally sultry voice say, "Please let me have your cock Lilly."

The girls laugh again, someone commenting on how you sound like you're in a porno. "That's Princess Lilly to you bitch!" Lilly smacks your ass harder than before, causing you to wince in pain. "And try to sound more feminine, girly-boy."

In your best girl voice you say, "Please, please let me have your juicy cock, Princess Lilly." The juicy slipped out, but based on Lilly's expression the girls liked it.

"Now say, 'Fuck my boi-pussy hard!' Marcia." Amanda laughed.

Once again it takes you a moment to gather up the courage, but eventually you stutter out, "Fuck my boi-pussy hard."

"With pleasure!" Lilly pulls her fingers out, applied lube to the dildo and then pressed the tip against your anus. She seemed to be teasing you, pressing it in slightly without fully penetrating for a few seconds, but sliding it in about halfway. Your cock immediately stiffens more and precum starts to leak out of your tip. Lilly begins gently pumping it in and out, until she has the entire shaft inside you.

Amanda walks over to you and leans it close to your face, whispering, "How's it feel to be fucked like a girl?"

You think for a little while while Lilly keeps fucking your ass, gradually getting faster and harder. A thousand thoughts are running through your mind. You feel... weird, gay, dirty, submissive, embarrassed, girly, weak, horny, powerless, erotic, pretty.

"Come on, answer her!" Lilly says from behind you.

Without thinking you say the last thing that came to your mind. "I feel pretty."

Amanda laughs and asks, "Do you like feeling pretty?" You meekly nod your head yes. She smiles, strokes your hair and say, "Well, we can help you feel pretty anytime you want to little sis." Amanda kisses you on the cheek then reaches down and starts jerking you off with one hand while pinching your nipple with the other. It feels so wrong to have your sister jerk you off while her friend fucks you in front of your crush and another girl, but you're so horny now you don't care. You start to let out moans of pleasure as waves of ecstasy sweep over your body. You aren't cumming yet, but it feels awfully like an orgasm.

Up until now, Lilly was doing all the work; however, you suddenly find yourself popping your ass back and forth to match her. Your sister grabs your hand and brings it up under your shirt to your other nipple. She bites your earlobe then whispers, "Pinch it as hard as you can bitch." and you comply. Your moans become louder as they transform into a mixture of pleasure and pain. Lilly gets annoyed by this and says, "Can somebody shut this slut up?"

Your sister and Lilly grab you and put you onto the bed, stomach-down, with your legs and ass hanging off over the edge.