Sissy Advancement Check-up

Today Im going to check the advancement of my little sissy. Very first I will embark with finding out how good she can blow the strap-on. Therefore I will order her to go down right between my and I have to say that she does a really good job sucking my rubber dick! But whats about a real dick!? I will test this too regardless what my sissy thinks about Yes, she has to suck a real cock right now!!