Let's see :
- Oppai ? Check
- Scenes with only 1 dick maximum ? Check
- Anal ? Maybe
- Tentacles ? Yes
Well... not for me. I'm out.
having browsed the CGs, I can say that this would be for you. The tentacles from what I can tell are being used by MC, and they never actually penetrate, just restrain. The one thing that does with one character is a leather chair, but from the CGs it is MC becoming the chair (cause well... it sprouts arms and a dick... and since MC be the one fucking things....).
The questionable ones are the ones with multiple ghost dicks... but since this is a harem game imma assume it is MC duping his dick with magic. (and there is only one set where he actually uses one for penetration, and I mean one, the other is just there chillin doing nothing). Ghostdick jitsu if you will. (MC himself is in that form, I think it is a thing where he can manifest multiple body parts, like 3 dicks or 5 hands, or 10 tonguejitsu)
So outside of that bit of weirdness it is safe. And proper harem. Also anal is a yes.