I wished ICSTOR would had wait for Linda-MC sex scene, because this should have been something special. Maybe Linda could had wait until MC finished High School and as graduation gift she would have sex with him.. But it doesn't matter anymore....
Here is another suggestion for story progress for Bob-Linda-MC-Judy:
Linda kicks Bob out of the house. Now the money is tight and everyone (MC+Sisters) need to support Linda to cover the expenses. Caroline fails to pay them and Linda force her out of the house... MC don't understand why and tries to contact her therapist (Judy). Judy has an idea involving letting Linda see how MC has sex with Judy (basically MC would cuckquean Linda!). Seeing MC having sex with Judy let her realize how Bob must have felt... Linda starts to change her personalty a bit and apologize to Bob*. In the meantime Bob had some time to thing about and started to change things too. Like he started to go to the GYM and has no longer a Beer belly and got into good shape (transforms into a Jeff Bezos (CEO of Amazon)). The new location (GYM) would introduce us to our new sexy/milfy Yoga/Gym-instructor....This also could lead Bob to accept the sex between Linda and MC, and maybe he could watch them once. We also could meet his Dominatrix (see note on Bob)..
*Note: I still don't thing it is Linda, who we see in Bob's little dungeon, but more a professional Dominatrix.
I know it is not good at all, but just an idea how things could progress for them.