Pages 4-7: High schoolers Kotomi, Kyou, Ryou, and Nagisa are at a public bath
Page 8: Kotomi reveals to Tomoya in the bath that the above was a dream

Pages 10-12: Parents Akio and Sanae bathe with their daughter, Nagisa
Page 13: Many years later, Akio laments that adult Nagisa won't bathe with him anymore

Page 14: Tomoya bathes with his daughter, Ushio
Page 15-19: A few years later, Ushio tries wearing a swimsuit to bathe with her dad without it getting weird

For Mei Sunohara bath stories by the same artist:
Pokapoka: https://e-hentai.org/g/1297371/71867d17d6/
Pokapoka After: https://e-hentai.org/g/3037746/9f19b79f8e/