Personally, I would like to see the MC serving Ann's kinky fantasies a bit more, to enhance her pleasure. Things they could do on their own could be facesitting (e.g. while she watches a movie), peeing on him, pegging him with a strap-on, orgasm denial. With other people he could participate by licking her ass as she gets fucked, eating her creampies (which has already been hinted at), sucking cock (maybe a trans character first) etc. There are plenty of things they could do, and these are just the sub ones!