Derek can't help himself, and they commence making out.

Derek has spent all the time since he last say Jayden telling himself that, no matter what hormones and new thoughts this body would send his way, he would never, ever, give in to them. It took about two seconds of Jayden standing there, eyeing Derek's female body, before all those objections crumbled away and Derek crossed the room, pressing his feminine mouth to Jayden's as he kissed the teenage boy for all he was worth. Jayden was clearly shocked, but he recovered from that quite quickly, leaning into the kiss and letting his hands roam over Derek's body, lingering here and there for a grope of his breasts, a tease of his ass.

When they finally came up for air, both were flushed and blushing. Jayden smirked at Derek, which the teacher couldn't help finding irresistibly cute. "Glad to see you came around, but that was just a sneak preview. I have a class soon, but my parents are on vacation right now, I have my house to myself. Come over after school, and we can continue this." Then, Jayden gave Derek a peck on the cheek and left the room.