Lucius most likely tried to convince severus to be his sugar baby at least once or just stay at home husband.
He would say stuff like you can work on your potions at home with a private lab and I’ll gives both more income!
Plus it’s pretty neat to have a beautiful partner waiting for him when he comes back tired and ready to be bend over a table 😌
Imagine Lucius, laid across Severus’s sofa filing his nails without a care in the world while Severus is hunched over a text book and has three cauldrons bubbling away;
Lucius: I don’t know why you won’t just come to the Manor, Sev. You could have a whole wing to yourself, and a house elf to keep an eye on your brewing while you read.
Lucius: Look at the tension in your shoulders! I’d be around to massage that away any time you needed it.
Severus: *getting more tense* Hmm.
Lucius: I’d have so much fun keeping your wardrobe up to date for you. You’d be totally in vogue at all times.
Severus: *rolling his eyes* Hmm.
Lucius, increasingly miffed at Severus’s lack of enthusiasm: Your own library full of rare books!
Severus: *lifts his head slightly, attention piqued*
Lucius, smug he’s finally got Severus’s attention: And of course a good few orgasms a day…
Severus, bright red: Malf! I’ve read the same line in this book thirty times since you’ve been here, will you ever cease your inane chatter?!
Lucius, chuckling: Need one now, hm?
Severus: *sighs* Fine… yes…
Lucius: *smirks and moves over to Severus’s desk* you’d have had a few today already if you were staying at the manor…
Severus: *pinching the bridge of his nose as Lucius works on unfastening the buttons at his fly* Salazar, give me strength.