Expansion semblance(Rwby harem x male reader)

Y/n L/n is the only one who hate his semblance. his semblance is named expansion and it give him the hability to manipulate the size of what he touch it can be organic or non organic things. he use it principaly to upgrade his strenght by making his arm expand. but why does he hate his semblance wohld you aske me. Well his ex's used him to make their body bigger and go see other guys. after this Y/n began to hate his power and only use it on himself.