Sissy quest

How can a eunuch fuck another NPC or player with nothing and has nothing biological to insert when spit rosting? Sissy quest is easy but had to try it to extreme. Even dick cut off he/she still on a "sandwich" when in bed. Pussy is still a option even this is biologically impossible. A castrated five year old male doesn't get a pussy as I know.

Bonus problem: Player, NPC A and NPC B get it on. Seems a random event when "sandwich" is possible. Sometimes all in !! Nice. Sometimes: no, no can. Only NPC B can fuck NPC A. Why? If dick/strap-on is present in a 3-some and all know each other. It should be a option. A obvious bug.

If played as a hetero I still say men is uteral useless. Never got note on fridge where serious fucking occured.