The beast and his beauties (massive crossover harem x OP male godzilla oc)

Blake is a pop idol/model? The battle against female Gilgamesh.

While Rias and her peerage were out taking out a stray devil, Toad was out doing his own thing but he noticed Blake walking towards a building so Toad decides to follow her. What he found out shocked him. He saw Blake in a different dress other than her usual school uniform.

Blake: what's the big idea calling me here during school hours?
Blake's manager: did you forget that you have a photo shoot today?
Blake: no. I just didn't want to do it today. I said I wanted to do this on the weekends.
Blake's manager: well too bad. I changed the schedule to today.
Blake: this is not what we agreed on. I have other things to do like telling the guy I love my feelings.
Blake's manager: I own you. You belong to me.
Toad: like hell you do you asshole!
Blake's manager: who the hell are you?
Blake: Toad!
Toad: what's all this Blake?
Blake: well I uh I'm a model. And a pop idol.
Toad: wut?
Blake: honestly, this isn't what I signed up for. This guy is treating me like an object.
Toad: then say the word and I'll smash his teeth in.
Blake: no. I don't want you to get in trouble because of me.
Toad: Blake. I want to do this. I want to help you. This guy thinks you're nothing but a money bag for him.
Blake's manager: and what of it? I'm the governor's son. I can do whatever I want. I have diplomatic immunity.
Toad: you think so? Because I talked with the governor just recently and he said that he's already disowned you for abuse of power and authority. So in other words, you ain't jack shit.
Blake: which is also why the governor has made Toad my new manager.

A short time after.

Blake: Toad. I wanted to thank you for helping me from that guy. I wanted to go against his ridiculous ideas but he keeps persisting that I did as he said just so he can make a quick buck.
Toad: I did never liked guys like him. But what you said earlier.
Blake: *blushes* uh well yeah about that. Yeah it's true. I love you Toad.
???: isn't that sweet? I think I threw up a little.

???: I am Gilgamesh.
Toad: huh. Another heroic spirit in the history records said that was a guy but was actually a girl.
Gilgamesh: look how smart you are. You will make a fine husband.
Blake: I won't allow it.
???: master!

Toad: Artoria. You're here.
Artoria lancer: I felt a massive power spike coming from your direction so I came to check to see how you're doing.
Gilgamesh: how cute. You actually think you can defeat me.
Toad: I don't think, I know I can since I'm a godzilla faunus.
Blake: my kind of faunus.

A battle between Gilgamesh and Toad ensued. As they were fighting, Blake decides to sing. Since she's a pop idol.

Blake:

But that didn't stop there, Yang joined in as well.

Yang: c'mon Toad you can do it.
Blake: my voice alone isn't enough.
Yang: then I'll join in too.
Blake, Yang:

Toad gained a massive confidence boost from that song and flared his aura while smirking.

Toad: I'm not the kind of guy who will hurt woman. It goes against my policy but in this case, I'll make an exception.

Gilgamesh: I underestimated you mongrel. But I admire your strength. We shall meet again.