Blackmail is petty lame and I hope we dont see it with Asuna. The mother is fine since its kinda already set up there, soo whatever.
But with Asuna I see her giving in to Inoda that night as her being super horney and just caving in. Like afterwords, she knew it was a mistake. She thought it was her last night with him, and just gave in to base desires. Now she will try and stay away, but probably slowly get horney with Kirito unable to satisfy her, and Inoda will be able to weasel his way back in. Probably start in game like, "in game don't count so its fine"etc. Then he get the mom, and use her to put him and Asuna in situations together. Like highering him to do somthing at the house, or the mom taking asuna on a trip, and inoda just "happening" to be there.