I keep remembering two serie and it's bugging me that I can't remember the names

1. (Not sure if its a Manga but it has an anime)
   The father and son fall in love with each other and apparently the dad had him when he was like 12-13yrs old (I think with his sister? Not sure )

2. The son travels back to when he father was young and both end up falling in love not realizing they were related then sudden the son is suck back to the past and meets his father and his father is shock that the person he fell in love with was his own son, they still end up together (okay wait I think the son did know it was his father)

Anyone know the names?

Second one you're looking for is definitely "Not Equal" by Ike Reibun. First one sounds a bit like "Papa to Kiss In The Dark" (because that one has an anime adaptation) but I'm not entirely sure since I watched it ages ago and don't remember much.

I'll read anything your mom wouldn't want you to.

YES those two are the ones thank you so much, idk I just randomly thought of them and need to find the names lol, ty

Haha, you're absolutely welcome, glad I could help! 😀 "Not Equal" is one of my favourites and just a really great story all around so I recognized your description instantly lmao.

I'll read anything your mom wouldn't want you to.