To tell the truth, teasing is not necessarily sex. Direct sex didn't finish last time. Later, I groped for it myself. I thought it was flirting to make that wave before sex. The safest way is to have a romantic relationship with a red heart and then buy a double bed at home. Go to bed to relax first, then choose the target and ask for cuddling, and then have sex after cuddling. I believe this can be done.