I need help looking for 2 tankoubon. The first one was a well known manga that focused on a blond twintail and a guy with glasses. The twintail was a tsundere, of course, and would constantly deny every advance made by the guy with glasses. This started because she had a boyfriend who dumped her over a misunderstanding, and who would later go on to date the guy's little sister. Their story ended in a different tankoubon, with the guy wanting a child and the girl unintentionally saying saying she wanted a girl (trying to avoid having sex with him).
The second tankoubon focused on a guy in a club and a girl who was caught by him without any underwear. She was known for being unapproachable and she tries to goad the guy into being a sadist, since she's a masochist. For the first half, it's just them screwing around, the second half focused on them, specifically the club member, trying to avoid this student council member whose confession was rejected by the girl and he saw her with the club member one night. It had something to do with what the club did while he was on the basketball team, and he's just taking it out on this specific club member who had nothing to do with it. It ended with the club member having a large scar across his face.
Thanks in advance.