There's something you should know about Regulus. Whatever Regulus does, and whenever he does something, he does it will full passion. I mean, only if he finds it interesting enough. He's a very passionate man no doubt about that

True, it might appear that Regulus doesn't seem to like you in the start, he might come off as bit rude as well but overtime he'll actually grow rather fond of you. He'll realize that he really needs you to be around him. He doesn't know why he gets a warm feeling and a feeling of happiness whenever you're around him. He's also the type to deny having romantic feelings for you at first

Regulus as a yandere would be really possessive, obsessive, a bit delusional since he thinks you really love him even when you don't and a bit of a psychopath too since he's willing to do whatever the hell it takes to make you fall in love with him and only him, not with anyone else. Oh, and he's also really REALLY cling at times. Actually cross that, he's really clingy 25/8

If you're a pureblood then you're all right for him and same goes for you being a half blood as well. If you're a Muggle don't worry, he'll still love you but like HELL will he let someone else tell him that he shouldn't be with you, he'll literally punch them in the face and end up breaking their teeth or something. He gets VERY VERY jealous whenever you talk to someone else other than him, especially his brother Sirius, he doesn't like seeing you so close to him, what does he have to offer that he doesn't huh?

He won't tolerate it if someone called you a Mudblood, be it his own mother. He's so crazy and deep in love for you, he's not willing to listen to reason that what he has now for you isn't love, it's an obsession. An unhealthy, dark and twisted obsession. And I also forgot to mention, he's a sweet talker too and he's a bit manipulative as well. He doesn't WANT to be manipulative, you're making him this way, you're turning him like this. It's all your fault for looking so cute and adorable and having those beautiful eyes

He'll act like a petty baby for even the smallest of things at times, this man is as unpredictable as the weather lol. If someone looks at you for a second too long he won't really blame you, he can never blame you for something, he'll think everyone else just wants to corrupt his little angel and he'll ruin their lives literally. Don't even get me started on this dude's rivals, he's from the noble and most ancient house of Black, he's a member of one of the most renowned pure blood families in society in the wizarding world, what do you expect, he'll just let them go just like that that? Oh no... his rivals would suffer the most horrific fate

Will he kidnap you? For sure, is that even a question to ask? He has a fantasy that you'll be at home, making food for him as he comes home from work and kisses you on your cheek and nose and hugs you, his cute little house husband/ wife. He doesn't want you taking the stress on yourself, why stress yourself and get burdened with anxiety when your dear husband is there to take care of everything for you

If you try escaping from him he will be heartbroken and devastated, why would you do something like that? He does so much for you and yet you're being ungrateful! He has to punish you for this you know.... and punishments depend on his mood, either you'll be let off with a light slap on your wrist and he'll lecture you about the dangers of the world and how you could have gotten hurt and stuff else punishments will be him locking you in a dark room for a while till you're ready to say sorry and admit you were at fault. He needs to discipline you first if you get out of hand, as much as he loves you, he won't tolerate any sort of misbehavior from you, it's for your own good you know?