Read manga: Koneko-Chan, Kocchi Ni Oide

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Summary:

From MangaHelpers: After Yuko graduated from junior college, she ended up running a shop. Though her career is going well, she hasn't had time to work on her love life. One day, she's out drinking with her best friend Mikan, bemoaning her lack of a boyfriend for a Christmas date. When she trips and hurts her leg, Mikan asks her little brother Leo (an 18-year-old) to see Yuko home safely. When they arrive at her apartment, though, Yuko makes a move on him and they end up sleeping together. The next morning, she realizes that she not only slept with her best friend's little brother, she actually took his virginity! Leo isn't satisfied with it being a one-night stand, and they start having a completely sexual relationship. Will she be able to keep this from Mikan, and is it possible their relationship may grow to something more? [tethysdust]

Chapters (38)
Apr 09, 2022
Chapter 36: Final Chapter - Their Paths [End]
Feb 21, 2022
Chapter 35: Goodbye Sex
Jan 24, 2022
Chapter 34: Incomplete Christmas
Dec 28, 2021
Chapter 33: Passing-By
Nov 18, 2021
Chapter 32: The Relationship Between A Superior And A Subordinate
Nov 01, 2021
Chapter 31: Ideals And Reality
Sep 01, 2021
Chapter 30: Living Together
Aug 02, 2021
Chapter 29: Your Feelings
Jul 10, 2021
Chapter 28: Men's Date
Jul 10, 2021
Chapter 27: Father, Daughter, And The Younger Boyfriend
Apr 17, 2021
Chapter 26: Thank You
Mar 15, 2021
Vol.4 Chapter 25: Doubt And Affirmation
Feb 11, 2021
Vol.4 Chapter 24: After The Fight
Jan 09, 2021
Vol.4 Chapter 23: The Man I Hate
Nov 30, 2020
Vol.4 Chapter 22: Secret Way Home
Oct 18, 2020
Vol.4 Chapter 21: Vs Stalker
Jul 26, 2020
Vol.4 Chapter 20: Mischief At The Cinema
May 11, 2020
Vol.3 Chapter 19: Un-Cute Woman
Feb 14, 2020
Vol.3 Chapter 18: Rising Expectations For Our First Trip
Nov 20, 2019
Vol.3 Chapter 17: Definitely Not Handing Him Over!!!
Sep 17, 2019
Vol.3 Chapter 16: Do You Love Properly?
Aug 25, 2019
Vol.3 Chapter 15: The Circumstances Of His First Time
Aug 25, 2019
Chapter 14: Men's Secret Meeting
Aug 25, 2019
Vol.3 Chapter 13: Love Me In The Bathtub
Aug 25, 2019
Vol.2 Chapter 12: Cheating Hearts
Aug 25, 2019
Chapter 11: Boy And Girl
Aug 25, 2019
Chapter 10
Aug 25, 2019
Chapter 9
Aug 25, 2019
Chapter 8: Erogenous Zone Of The Heart
Aug 25, 2019
Chapter 7
Aug 25, 2019
Chapter 6
Aug 25, 2019
Chapter 5 : Sex That The Heart Feels Too
Aug 25, 2019
Chapter 4 : Night At The Hotel
Aug 25, 2019
Vol.1 Chapter 3 : Our Relationship Is Only Physical
Aug 25, 2019
Vol.1 Chapter 2 : The Devilish Little Brother Is In Heat
Aug 25, 2019
Chapter 1.2
Aug 25, 2019
Chapter 1.1 : My Friend's Little Brother & I Are In A Sexual Relationship
Aug 25, 2019
Vol.1 Chapter 1A : My Friend's Little Brother & I Are In A Sexual Relationship