So obviously, on a surface level Flowery is meant to be a Rudy stand in. College best friend, helped him "get the girl", and they do typical "guy" stuff like going fishing. They even look alike. Flowery seems to be attempting a platonic male friendship here on a base level.
However, where Flowery goes absolutely off the rails is that in trying to be what Asgore needs, he then tries to take every role in Asgore's life. At once. He refers to himself and the flowers as Asgore's "family", and I think the vagueness of the term lends to how Flowery starts trying to fill up any role Asgore is missing.
He's very physically affectionate with Asgore, and states that Asgore doesn't "need" Toriel anymore, implying that he's trying to also approximate a sort of wife figure to Asgore. Asgore later makes this parallel clear by comparing Flowery's affections to his own for Toriel, creating a plausible romantic interpretation of his behaviour.
This becomes really concerning when you remember how Asgore was essentially caretakers to all the flowers. He took care of them, read to them, etc etc. Flowery also tries to push away Asgore's actual child, Kris, and distracts Asgore from them. This is, of course, because Kris is a threat and Flowery knows they're acting shady, but there are also meant to be parallels with how Asgore neglected the flowers and his actual family, including children. And Flowery makes sure *Kris* sees all of this, as if to say "Look at how he's fine without you". While I don't think Flowery explicitly views Asgore as a father figure, the energy is definitely there and it's a bit weird.
Tl;dr: Have you watched the Interview with the Vampire TV show? There's a bit where Daniel Molloy says to Louis de Point du Lac "I could be your Lestat [Louis' husband], I could be your Claudia [Louis' sister/daughter]" (paraphrasing) and that line and Flowery mildly disturb me on a similar level.
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