Step-Mommy Caretaking Turns Into FREE USE RELATIONSHIP

My poor sweet StepSon got terribly injured playing baseball and now he's stuck with 2 broken arms in casts! He's going to need help doing everything for the next few weeks :( He's not even able to feed himself, dress himself, or bathe himself! Thats okay, I don't mind stepping up to make sure he's comfortable and satisified!! The only thing is that when I give him his first bath after coming home from the hospital, I notice that he got an erection under his swim trunks! I was shocked but I reassured him that it's totally natural. A few days later when I'm getting ready to bathe him, I tell him to get in the bath totally naked so I can properly clean him. Of course he gets an erection again and I quickly realize that he has blue balls from not jacking off!! I dont want him to be more uncomfortable than he already is, so I offer to lend a hand and give him a release. Once he cums I make sure to tell him that if he ever needs another release that I'm always here to help. Maybe I shouldnt have said that..... Over the next few weeks it seems like hes CONSTANTLY asking me to jerk him off and release him. I cant help but enjoy making him feel that good.... Once we go back to the doctors and get his casts removed, I find myself feeling pretty sad.... I've really enjoyed these past few weeks and I'm upset that it wont continue. Then he suggests that we could advance our relationship into free use and explore much much more......