You and Valerie dated for a month and finally decided to have sex.
You two are standing in the bedroom, embracing each other. As you kiss her passionately Valerie trembles in your arms. You gently massage her soft breasts with the palm of your hand and your girlfriend's pretty cheeks take on a pinkish hue as her breathing becomes erratic. You slowly run your hand down her body and onto her crotch and feel... a lump down there.
"WHAT THE?" you take a step back, shocked.
"Ha-ha-ha" your girlfriend starts to laugh hysterically while pulling a lump of socks from her panties.
You are not impressed.
Valerie is quite a prankster and played a few jokes on you before, but you hoped she would at least take your first lovemaking seriously.
"You should have seen your face, ha-ha-ha."
"Yea.. ha-ha... ha-ha.." you slowly move toward her while making this awkward laugh, then embrace her from behind.
"Hm?" she turns her head around.
"Well, since you are apparently a guy, we have to do it like boys do it."
"Huh? What do you mean?"
"Can't do it normally, so we'll have to do it in the ass." you hug her stronger, pinning her arms to her body.
You see her eyes widen in fear.
"W-wait, I am a girl, it was just a joke. We can do it the normal way." she tries to escape your embrace but you hold her firmly.
"Just think of it as a little punishment for pranking me."
"No, please, I am not ready for anal. I am sorry!" Valerie pleads, struggling in your arms.
"Oh, I am also very sorry for what I am about to do." you restrain her hands behind her back and press her face-down into the bed, straddling her in the prone bone position.
"I am sorry, I will never do it again! Please stop!"
"That's nice to hear." you pull down her panties and start fondling her soft plump butt "It may hurt a little, but please bear with it."
"No, don't!" Valerie starts crying and thrashing around.
"Don't move or it will hurt more." you say as you press the tip of your cock to her ass.