This entire tankoubon follows a pair of siblings and their equal obsession with fellatio.

1. Two Siblings' Fela Pure
   Despite their daily fellatio regiment since childhood, it has taken until now for a pair of siblings to realize their romantic feelings for eachother.

2. Two Siblings' Fela Pure, Another Serving
   With Keiko bedridden, it's up to Noboru to care for his sister (in more ways than one).

2.5 Two Siblings' Fela Pure, A Peaceful Day in Keiko Mitarai's Life (With Readable Noboru Gauge)
Thanks to her student council responsibilities, Keiko can't get a break at school and ends up going crazy on Noboru when she gets home.

3. Two Siblings' Fela Pure, The Third Cup
   The pair of siblings and their antics at a local summer festival.

4. Two Siblings Fela Pure, 4th Cup of Cum?! Have Some Self Control!
   Keiko drills a hole in the wall between their rooms for Noboru's anytime use... and she means ANY time.

5. Two Siblings' Fela Pure, 5th Cup
   It seems that dad picked up some "Fountain of Youth" pills while out travelling and sent them home. Noboru finds out first-hand how effective they are.

6. Two Siblings' Fela Pure, 6th Cup!? Oh Jeez, Just Do As You Like! I Don't Care Anymore!
   After getting frisky in a photo booth, the couple decide to continue in a booth (and later the bathroom) of a local restaurant.

7. Mitarai Style Oral Care
   Every evening Keiko brushes her teeth twice; once with a toothbrush, then again with something entirely different.