It's a very vibrant red underneath, I'm too curious not to try and narrow down the species.
what color is the underside of the cap when bruised? (like when you score it with your fingernail, does it change color quickly?)
The underside instantly darkens when scratched. I'll add that it smells very sweet and fruity.
Bonus pic of Indigo Milk Cap I found as appreciation for the help:
Thank you.
I ran through the field key in Bessettes' & Roody's Boletes of Eastern North America.
I think one possibility is: Caloboletus firmus.
The stalk is pretty beat up, but it seems like it might be a net stalk, so I went with Key B-3:
Net Stalks: with pores some shade of orange, tan, buff, red, maroon, brown to dark brown, or nearly black, p. 34
Then I chose:
1b. Pores not radially arranged and some shade of orange, red, maroon, or brown to nearly black โ 2
2b. Pores red to orange โ 5
5a. Cap whitish to grayish, grayish brown, or grayish olive; pores pinkish to red or red orange, sometimes yellowish at the margin when young, staining blue when bruised โ Caloboletus firmus (p. 189)
This seems pretty solid to me, I think it's a match!
I don't know, but I wouldn't eat any boletes with red undersides.
Without a spore print I cannot be sure but it looks like a Lurid Bolete to me.