Hey, you never know, he may have a crystal shard that he can control the girls with. Even if it's just to love him more....
He's also got a picture of Christine in a compromising position in one reality and given how the various paths were colliding in the last update, I wouldn't be surprised if all versions of Robert have a copy. And we know with a candid picture, these girls can be blackmailed into having more pictures in more compromising positions taken....
As for the pictures Silver probably has of Lola and Julia.
While I get what others have said about rape,
@T4bbo and
@Burt Reynolds Mustache have proven they are not averse to a little dubious consent, sleep groping, dreamforcing and all 3 main men have had a chance to have a go at at least one. I don't think it's a huge leap from Robert adding a little something to a wrong decision and a dick being at the very least knocking on the door of somewhere it's not welcome
What I would add to MWeb's replies is that although there has been very little action with Robert/Silver in the last 2 updates, I can understand why. They have been setting up the main event, the boat. Which barring HHD meltdowns and Patreon interference should happen in the July update. If another technical issue comes up and they have to split further, I can imagine the MC losing out and a focus on them, before bringing it all together. Failing a split, I think the 1st part of the next update could be pretty uncomfortable for MC followers. Only 3 1/2 weeks to go....