She brainwashed him to be fuck-addicted

"You'll know soon. And I'm sure Alex and Chaz will love it." Dr. Summers replied.

You were surprised by her words, but a second later found your clothes being torn apart and your hips being pushed forward. You felt really embarrassed by being naked before the others, but it was nothing compared to what happened next.

Dr. Summers unstrapped Chaz and helped him stand up. "How are you feeling, Chaz?"

"What have you done to me?" He asked a little whiny.

"You'll know when you look over there." She turned Chaz' head over to you.

You saw fear appearing on his face. "No! You didn't!" He tried to look somewhere else, but it was like his eyes were glued on you.

"You know you can't resist it. Go there and get what you desire." Dr. Summers pushed Chaz forward and the boy began to walk.

Chaz went all the way towards you without taking his eyes of you, or better said your lower body. "I don't wanna do this, but I can't fight it." He said while he unbuttoned his pants. He pulled them and his underpants down and revealed his pussy. You were shocked and couldn't move as he climbed on your lap. With fear in his eyes he moved his hips back and forth and rubbed his pussy against your penis. It was really soft and quite wet.

"Oh my god!" You could hear the others being really surprised by what Chaz was doing. But you weren't less surprised. You weren't gay, but Chaz rubbing his pussy against your penis caused it to get hard. With fear you looked into the fearful face of Chaz as his hips stopped moving and the tip of your penis was still touching his pussy. You knew what was coming and didn't wanted it, but there was no way for you to get out of it.

Chaz pushed his hips down and your hard penis started to enter him. He lightly moaned as he got penetrated. He then continued moving his hips around, up and down, back and forth, left and right. He was actively fucking you with his pussy and his moans betrayed his face. He was clearly enjoying it.

You too felt betrayed by your own body. Despite him still being a boy and the only female about him being his genitals, you got rock hard and felt really good during your first sex of your life. You regretted it being with a boy, but as said, there was no way out of it.

...

"Good, with that we have one changed and one of the masterminds punished." Dr. Ryan said and turned towards Rick. "Time for the second."