Alright

I disagree

But the two are a really good duo, but more as in best friends.

I can't describe it, but they just have that playful relationship that you only see two good friends have, you know?

And also Tsuruno is- I think- 19, and Felicia is 13. I excused Iroha and Yachiyo's age gap because it's only 4 years, but anything over 5 years is to much for me-

But they have a great relationship, if they think something's a trap they'll freakin go anyway and just figure it out.

OH WAIT

I KNOW HOW TO DESCRIBE IT!

Tsuruno and Felicia have a sort of Papyrus and Swap Sans relationship! It's just a really sweet one. They have each other's backs but constantly get into fights, then make up an hour later.

So, it wouldn't work in any sort of romance, but it's really good if they're best friends :)