Still funny re-reading and all of his "she HAS to be acting, right!?!" reactions. Like, yeah bro, she's acting alright just not the way you thinking. If she wasn't acting she'd be flushed, drooling and probably koala hugging you XD
Realest sibling behavior I've ever seen in a manga. Also damn Ayano, wasting phone battery just to have his photo up like that XD
In all seriousness, should accept her feelings but reject the commitment. She's not legal and he still feels like a father to her, that's not shippable.
Honestly just tell Allen the truth. He's the hero and a surprisingly good judge of character. Can tell a half-truth like "I've seen a possible future of ruin and have been working to avoid it."
I still think the guy really kept up the mask of a "toxic persona" way longer than is realistically possible for a sweet boy type. Friend of mine tried to be something different when he started streaming but, as is typical for masking, it slipped after 3 months and he completely dropped it by 6...