I don't doubt he would want to fuck anyone he can get his dick into, but I think overall even if he was semi clever in Part 1, he hasn't really showcased the ability to actually really pull anything off himself. Suguha/Leafa seems way more paranoid and aware of things to even give Inoda the opportunity to do anything is how it feels like. Also if Hebishima couldn't win over Suguha, I doubt Inoda would be able to. But yeah, it's mainly that I think Inoda would recognize Suguha/Leafa more as a threat and convenient indirect ally towards him getting Asuna to further distance herself from Kirito.
Also in regards to Liz, I think Inoda thought he could at least semi get away with it. Suguha/Leafa probably won't believe a damn thing Inoda says and probably views her in the same light as Liz, which is basically an enemy/threat to Kirito.
But yeah, even if Inoda does end up fucking Suguha/Leafa, I doubt it'll really go anywhere positively for him, so it's probably not going to get written as such. Like Sinon was crazy enough to sex change Hebishima, so this means to some extent that Suguha knows the people available to also do the same shit to Inoda. Basically Fujino can't really write it in that Inoda is able to do anything to Suguha/Leafa, with the way things are right now.