you could also add colored cock rings with personalitys tied to them
yellow is a happy breeder you try your best to fill your mate up buuut you also try to pet them to make them happier
red is domination you dont care about your mate all you want to do is pump them full normally having a negitive to the cap so if the cap is set to 500ml with red you will pump them full with 600ml the idea being that your still being restricted but your main desire is to fill them up so your cock and balls are much stronger and in turn pop the lock open just a tad
green is jelly meaning if your mate is found near someone or you breed someone in the same room as another person you will push them down and start doming them saying things like how dare you look at another person
pink swaps you to the sub and makes the girls take a dominate stance as your just a good little sub who loves watching your mates enjoy themselfs on your cock