sister/brother/brother incest
Now, in a different post (possums.gay/notes/aheij0huje70s2g3) I mentioned that Julia and Julius might want to involve their other two siblings in their, mhem, relationship. And so, I'm getting hot and bothered thinking about this particular scenario, where Seliph catches them after the act.While out with a group of friends, the twins snuck away somewhere quiet, and had a rendezvous together. While they come back, trying to fix themselves up as if nothing happened, they're seen and heard by their older sibling. He scrutinizes them, and mentions he had suspicions about their activities.
Seliph is about to/is already chastising them, but then Julius tries to divert attention by saying how Seliph must have felt "left out" by their antics. Which appears to irritate him more... Julia tries to stop him, but again not very hard, and she is blushing more and more.
Julius enjoys pushing Seliph's buttons... He half excepts it when he grabs his wrists and holds him against the wall, glaring at him with heavy breaths. "I really wish you wouldn't tease me like that," he says. Julia gets behind Seliph, ostensibly trying to pull him back, but again not very hard.
Then Julius says "Why don't you tell me how you feel, Big Brother?" Last part whispered in his ear.
This compels Seliph to crash his lips against Julius' and they roughly make out. Julia watches from behind in awe.
And they all give each other handjobs and kisses in the alleyway just out of sight. No one catches them, I imagine they would have been at a street fair or carnival or something at night. So they get some quality time together!