this may sound stupid, but how do you kiss the teacher in erotic sim date? i get that you click once for the lips, but where do you click the second time?

Mandy,

Do you play at Lesson of passion ?

If it's the V1 game, (if i good remember) click on her lips, a circle appears with a little red circle on top, and a little orange circle on the left of the circle. Just click once, the red circle start moving around the big circle, and you have to click when the red circle is on the orange circle on the left to succeed.
If it's the V2 game (black edition), click on her lips, a circle appears with lips on top. Click on those lips, then move them ON THE CIRCLE and make a turn up to the top, then click once again.