Tomoe is at home and isn't going anywhere. If you remember that scene on the train, it should hint at something. The scene on the train is a kind of signing of capitulation, with permission to do "whatever you want". Now the only thing standing in the way of "whatever you want" is Sheila... but if Sheila hadn't interfered, then "whatever you want" with Tomoe would have already happened - remember the scene in the kitchen, when it turned out that there was no milk in the bottle, but Tomoe offered MC her milk.
in other words, Tomoe is no longer MC's mother, but only his personal domestic guilt-driven slave sex maid, for whom MC simply has little time to start having sex with her.
it's not MC's fault that there are only 24 hours in a day - and so many events encountering =)
If you strain your memory, you'll remember that Sheila stole Tomoe's dildo toy and Tomoe is forced into a sexual abstinence regime that slowly melts her brain, turning her into a bimbo. Don't worry, Tomoe will willingly sit on the penis of the one she gave birth to herself (and to whom she promised to give birth to as many inbred children as he wants) - and the son's revenge on his mother will be fulfilled. It will be fun, but it will be even more fun when Tomoe helps her son apply sexual education methods to her own daughter. (and this is also part of revenge hehe)
about guard dog - of whom? Helen? do you mean PE teacher? it's matter of time, man...