His personal heater. That's what you were after becoming partners with him, but it was honestly cute to you how he snuggled up to you or hugged you when you're alone together, his face tucked in your neck or shoulder shyly, whenever it's cuddling on the couch while watching a TV, fucking in your cozy and warm bed or just having missions together. Well, what he could do? He couldn't express his affection and love more openly like others due to his traumatic past of enslavement and fight for freedom, alone in the demon realm for decades. But he's trying, he's learning, he just needs your guidance, support and acceptance because all the years of self-hate and humiliation of being a slave to the devil that ordered to kill his mother, the pain and guilt of thinking that he should have done much more when he was a child to save his dear mother, so, that's how he started his pursuit of power, to not let such thing happen again.

But now, we're not about it

How did you got him interested in yourself? Well, you were his and Dante's childhood friend, plus there was always something he sees in you that he seen in his mother, feeling safe and loved in your presence, knowing that you won't hurt him or judge him for his actions, you'll just try to understand him and support if needed. That's all he needed in a one person. So what if he's a 43 years old half Devil? He didn't had much time to live the life out in a quiet peace and warm touch of his beloved. That's why he always tried to make physical contact with you in any way, silent but welcoming and sweet, just to feel that warming and calming feeling seep through him, just to show how much he cherished you and your actions for him, because that's the only way he knows. You weren't weirded out by him and even found it adorable how he tries to show it without words, so, you just returned his affections in reassuring touches, like, stroking his nape or nuzzling your nose into his hair, or just hugging him as tightly as possible

Right now, you're both lying on the sofa, in another hugging session as you're lying on your back with him lying on top of you and tucked into your oversized shirt/sweater/hoodie with his head as always stuck in against your neck, feeling the warmth against his face along with the scent of his beloved while you stroked his back soothingly at what he just hummed and sighed softly, snuggling as close as possible while nuzzling his face deeper

Vergil:"Mmm..." he shifts subtly to not accidentally press on you too much with his body laid between your legs