Ejaculation by rubbing a penis against an unsuspecting, clothed buttocks or vaginal opening while wearing underwear AARM-165

I love buttocks; I can't suppress my urges when I see a woman's unguarded buttocks. I want to touch them, to feel the elasticity of both sides of her buttocks and the cleft with my fingers or palms. I want to rub my penis against her buttocks, savoring their elasticity. I want to press my penis against her buttocks, inserting it into the gap of her underwear, wanting to be sandwiched between her underwear and buttock flesh. I want to ejaculate onto her underwear... I want to release my semen onto her buttocks while she's wearing underwear. I want to make her underwear wet and sticky with my thick semen.