I also think Ezio/Rosa/Leo would work, with Rosa getting rocks off being all voyear and not minding Ezio/Leo because she has a deep and abiding friendship with Leonardo because he's a genius who brings beauty into the world and is confident that Ezio's her baby too...
and having Ezio go off on his fun times leaves her plenty of time to get it on with some of Sister Teodora's courtesans...and sometimes Ezio participates in that too...
Re: OP
I also think Ezio/Rosa/Leo would work, with Rosa getting rocks off being all voyear and not minding Ezio/Leo because she has a deep and abiding friendship with Leonardo because he's a genius who brings beauty into the world and is confident that Ezio's her baby too...
and having Ezio go off on his fun times leaves her plenty of time to get it on with some of Sister Teodora's courtesans...and sometimes Ezio participates in that too...