Rare good straight smut

I Became My Son’s First Love
Artist: Pabane
https://bato.to/search?word=I+became+my+son%27s+first+love+

NAME: Onoko Ya Honpo (Kamiwo Akira)[Author] Watching Porn Videos Alone with my Dad [English]
Link: https://nhentai.net/g/520920/

It's really good for delving into female sexual anatomy
Really good
Like this is the only manga I've found that explores the vagina this way