I have a thought...
So like, Dennis shipping Robby and Abbot.
He sees them interacting together, he's just thinking about how hot they are together.
Robby comes over to talk to him about something but all Dennis can think about is Robby and Abbot ruting against each other.
He spots Jack doing literally anything and he wants to know what positions he can put Robby in.
He doesn't know he stares with a certain look in his eyes as he fantasizes about the two.
Robby and Jack notices.
How could they not.
They're obvious to the looks he gives the other though.
Robby panics, brushing it off at first. That sort of relationship would be very inappropriate. But he likes that those eyes are just for him.
Abbot (that freak) digs it. He likes that he can make Dennis flushed whenever he walks into the same room as him.
Robby notices Jack noticing Dennis and he thinks he's got no chance.
Jack notices Robby noticing him noticing Dennis and (that freak) has no problem with a threesome.
Dennis notices Robby and Jack noticing each other and starts plotting on how to get them together.
Just two delusional old men and some loser who ships those two old men.