I finished "My Step Father Is Mine". Just a so so. Neither boring nor so exciting.
The father turns to be wife. Age difference about 17-20. The boy was horny all the time and family was so much open minded. I like when they have a child, some scences are too cute. Also have a 2nd book with chile love life. Chapters are short, takes 5-10 minutes maximum to read a single chapter. They have a son with the help of IVF not mpreg story.