its a interesting question, maybe be relevant can use some strap-on for girls or at least a invisible dildo (beacause put another character fucking all times can see it if no be hidden by the floor or a wall)
you cannot currently do this to all characters in game.
Ilinir (female dragon) and Charlotte (cow) do however have herm and futa options and the ability to flatten their chest so you could have 'male' versions of these characters.
i've seen some interactions where people achieve a similar effect by turning a character with a penis invisible and placing them 'inside' another character so that it appears they have a penis. this wouldn't work for adding breasts though.
Just a suggestion, the next time the devs make a femboy, you guys "could" kill two birds with one stone by adding breast and swaping the genitals and introducing them as a set of twins...>3>
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Ilinir (female dragon) and Charlotte (cow) do however have herm and futa options and the ability to flatten their chest so you could have 'male' versions of these characters.
i've seen some interactions where people achieve a similar effect by turning a character with a penis invisible and placing them 'inside' another character so that it appears they have a penis. this wouldn't work for adding breasts though.
Well, if you are crafty enough it might work.
http://imgur.com/a/5BLDI