G.F had MMF threesome

I'm 21 and she's 19 and we are deeply in love plus engaged ! she lost her virginty at 17&1/2 and has had a lot of partners since then . I don't care about that but 6 months before 'us'

she accepted her fuck buddy's asking to bring his friend for a threesome.

Both were straight so I said that's a tag team not a threesome! yuk >-< !