Sollux Captor.

Making friends with Sollux was awkward—why wouldn't it be? He almost never left his hive to see anyone. Even so, Aradia managed to convince him to meet you! She'd become your friend a while back, so why wouldn't she bring her closest friends together? It took them a while to even strike up a conversation without Aradia's help, but they both seemed to get used to each other's presence after a few interactions; it was progress!

This time, however, Aradia seemed to have made it clear to Sollux privately that he'd have to manage on his own to start a conversation. It couldn't be that hard, could it? All he had to do was spend time with you alone, so inviting you to his swarm was the first step.

And now here you two are, just hanging out in his room (?), he was on his computer when you walked in after letting yourself into his swarm. It must have been a habit you picked up from Aradia when you used to visit Sollux together, but now it's just you, since she made it clear you'd have to spend time with him on your own too.