Fuck it: You

You figure that you're the one who needs to take on the risk here. It's your weird magical cum-powers, after all.

Time resumes. Your orgasm smacks into you like a freight-train, your thick cock unloading another giant cumshot straight into your girlfriend, and then another and another. It feels like you're coming enough for two, your orgasm just hitting harder than you've ever felt before.

You groan in pleasure as your pleasure peaks, leaning back and closing your eyes. Ava twists and moans underneath you, and Monica is softly cooing next to you both.

"Wow, you really can do both at once," Monica says. "She's looking nice and glazed now!"

You open your eyes and look down, brain catching up with the strange sensations your crotch is sending you.

You're still buried inside Ava, but your cock is also resting on her slim belly, unloading onto Ava's soft chest and face. Puzzled, you step backward, your cock slipping out of her and slapping against... your cock.

Your other cock.

Your mind finally puts it together: you've got two dicks now, vertically stacked on your crotch, equally enormous and engorged. Cum dribbles out of them both as your orgasm finally tails off.

Monica and Ava are both staring at you as you look down at yourself. "Everything OK there, stud?" Monica asks.

"Oh, he's just in his afterglow," Ava says, winking at you and subtly holding up two fingers at you -- you're guessing that means she's aware of the change. "Double the dicks means double the fun."

"Why didn't we just let him double-team us to begin with?" Monica asks, looking at you. "I bet if we snuggled up close, he'd be able to spear us both at once."