No, you want to convert him right now.

You decide that this is not going fast enough, and pull at Luke's erect penis. "Hold that stiff!" you direct him, then move to get up. Even if you weren't still in your whole swimsuit: he is slightly taller than you are, so you'd have to pull out of his mouth anyway, in order to get him to plug into your hungry pussy.

You pull out of his mouth, leaving Luke inhaling sharply, then gasping for air freely and coughing. You grin madly. And then you strip out of your slightly sweaty pink swimsuit, letting fresh air onto your moist pussy again. You throw the thing towards Robert, who is playing with his pussy as he watches you and Luke. He sidesteps the projectile, and it floats to the floor.

Luke is lying on the bed, grinning leecherously as he points both of his indexes towards his erection. You roll your eyes and avoid jumping right onto his penis, but you move decidedly. You take on a riding position, grinding your wet pussy against his balls. He twitches in your hands, and you pat his reddened tip lovingly, before kneeling up and feeding it slowly into your lovehole. It is a good fit, you realize as you moan around your own penis. The tock sticks out of your mouth, almost ready to vibrate again, and longer than his.

He has grabbed onto your tits again, but you shake your head and bow down towards him. "You need to pleasure my tock." you purr, and slowly start grinding your pelvis against his. Just as his left hand grabs your tock, and his right one touches your tip, Luke's eyes begin to glaze. He stares right into yours, and you see the dots of dark green shifting a bit.

"Eye contact!" you order him. "I want you to deflower me!" At your lie, his hips begin to buck, and he cums right into your womb, warm fluids spreading all through your inner folds. Breathing heavily, you struggle to maintain eye contact. And then you see how the dark green spots in his irises spread further, swallowing all the light blue in there. The mutation has been triggered.

"Yes. YES!" you gloat. "You did it! Luke, you did it!" You wipe some rolling sweat out of your face. "Luke, that was great!"

He has turned himself into another sex mutant by fucking you, and he beams proudly as you continue to ride him for a while. In less than a minute, his irises turn solid dark green, matching his hair color.