Ahhh, Ice it is a tough spot you are in that is for sure. There is no loop hole. Lets look at it logically. The fact that you are looking for a loophole means that deep inside the choice for you to have sex with him is wrong. You are looking or justification to do this act. I would just at this point Ice remain friends with the man.
Curb your attraction and save it for the very lucky and special guy that will come along when the time is right. Sex is not just a physical act. It can be charged with emotions especially if it is just one way. If he can’t or won’t reciprocate your feelings, then sex with him will cause you emotional distress in the long run. I was not always middle age, I too ran through the Hormonal gauntlet with my peers. I know from sad experience that sex is not the way to do it.
Now the guys may say otherwse and there will be some other women that wil say otherwise. But, if you are searching for loopholes, justification and legitimacy on having sex, then you know deep inside it is wrong for you and you will feel lousy if you go against what you hold as right. Don’t do it.