How did it start with cum on my tits?

so a few have asked how did it start? it started by my dad asking to see me in my bra. it progressed quickly to joking about taking it off. I did it with little regard to how it might play out. then my dad wanted to show me how excited he was. he sat at my desk and masturbated. I was thrilled by the action itself. so in the months and years to come it advanced to between my tits he would cum to then onto my tits and nipples. he would wipe me off and got to feel me.