Girl 20

At work there is a girl that found out a cant make babies. about a yr ago. came to my place after work and wanted to talk.asked if i would let her get on top and ride my c*** . yr later she is still wanting it. now its up to 3 or 4 times a week on and off. she sucks me hard then gets on rides for an hr or so.or till i c**. gets off sucks my c*** clean. then wants it doggie for awhile then sucks it clean again.. she now wants more .im older now what?