It actually was, but you need to remember the whole subtext of the game to do so, checking the forums you will see Hebishima actually got Sinon to get him some real drugs he spiked his drink with the first time in the karaoke, AND then the second time at the cafe, that's how he recorded her masturbating while moaning for Kirito and managed to blackmail her into start doing sexual things with him :O
Asuna has already been confirmed several times that she will only be fucking Inoda, this is something Fujino refused to buldge in, even when he offered the possibility of the other girls getting fucked maybe by others Asuna was the only one he left out of the poll.
Regarding Suguha, see that's the issue, WAY too many people in SAO Hentai just throw her into "NTR" situations just because she's in love with Kirito, completely missing both the point of her choosing his happiness over her feelings and also that she's literally the one out of all the girls that Kazuto actively rejected, so NO situation where she's getting fucked by others is 'NTR'. Hilariously, the only actual NTR one could make of Suguha would be if they had her fucking Kirito against his will behind Asuna's back in the hope of stealing him from her, but because NTR of named series usually focuses more on screwing over the MC than on the actual literal meaning of NTR this never happens. I think legit I have only ever seen one doujin like that specifically involving Suguha (And one of Liz), one of my favorites, it had her going full-on yandere on him while he was trapped in SAO and was constantly riding his dick whenever he was doing it with Asuna in the game, then when he logs out at the end of S1 she's waiting there for him in the shadows with a full-on pregnant belly giving him a 'Welcome back, Onii-chan~'. Legit amazing and much better than all the generic NTR most usually write of SAO XP