I love watching my son-in-law fucking my stepdaughter's pussy

I can't deny that I feel an absurd pleasure in standing there watching my son-in-law fuck my busty short stepdaughter's smooth and fleshy pussy. I feel a huge boner with this kind of situation and I get completely wet with desire, touching me and caressing me with my hands, watching her all naked sit wide open on the huge cock that the boy has, moaning in that naughty way with pleasure that she felt and that made her cum several times during their sex.