In that kind of situation, it would be strange to stubbornly refuse with, “No, I don’t need it!” But saying, “Are you sure? Then I’ll take ¥○○,” doesn’t feel right either…
If it were me, I’d explain specifically what I need, how much it costs, and why I need it. Being specific makes it more convincing and may ease your papa’s doubts—namely, “Do you really need that?”
For example: “I have to buy a book for one of my university classes this month… (paste a link from Amazon or somewhere). But it’s expensive, so I’ve been looking for it on Mercari…”
Then, if you paste a Mercari link, he might say, “Don’t buy a used one. I’ll get you a new copy.”
I feel embarrassed writing about techniques like this because it makes it sound as though I always handle things this way. That’s not the case at all—I’m only suggesting it because I think this approach might come across as cute from your papa’s perspective.
Update:
You wrote that he “wants to see you repeatedly,” so I assume you don’t actually want to meet your papa. In that case, it might not be a good idea to have him buy you things. He might think, “I bought this for you, so you don’t have to keep working. You can meet me now, right?”
It’s difficult to strike the right balance, but rather than saying you’re busy because you need something, I think it would be better to say something like, “One of my coworkers quit, so my workload suddenly increased.”
It depends on your relationship with that man, so it’s impossible to say.
That said, generally speaking, if he offered to support you, I think it would be fine to at least discuss the details.
