I would say that it would fall under masturbation, but under a far more pleasurable instance
After, there are few who can successful attempt autofellatio, but those who can do so because a mouth is far better than a hand
If it was a clone, it wouldn't be masturbation nor incest. It'd just be sex... with yourself
Afterall, he isn't directly related to you, even if he is... you. He's a clone of you, far from being you considering he was genetically created rather than being born from the same mother.
That point would differ it from being incest
And masturbation is a solo act
Anyone try sucking their own dick before?