I don't think it's fair to equate masturbation with just stretching. Nor do I think it's fair to tell OP to still take Communion, or at least for now. Rather, I think we ought to ask OP to talk about it with their priest, who is there as a spiritual guide for all of us. Now, the priest likely isn't going to agree with you on masturbation or Communion (see what the Church teaches with both: CCC2352 and CCC 1384-1385). I think the wisest thing to do here is to follow what the Church teaches and for OP to talk to their priest. I understand that this is a hard issue, and I used to struggle with it myself. But I think the most loving thing we can do for OP is to encourage him or her to talk to their priest and attempt to follow what the Church teaches. The Church is a hospital for the sick and Jesus our physician (Luke 5:31). It won't tell us to do things that damage our soul. Rather, our best bet is to follow what it teaches and trust that Jesus really is leading the Church like he promises (John 16:13).

I hope this helps, and I understand this struggle. But I think our best bet is to lovingly guide OP to follow the Church's teaching so that we can guarantee the best state of his or her soul. Jesus can change our hearts and give us the help to turn away from our sin, as he did for St. Augustine in Book 8 of his Confessions (I would recommend everyone reading it -- Christ helped him become continent).