Gakuen Shimai

These two shows are the same in varies ways 1. they both have incest between three siblings 2. there is a love hate relationship between the younger girl and the guy 3. the older sister loves her brother 4. they all live together in one house 5. the male has loved the older sister for a long time 

Similarity : Having sex with older sisters Different : Yuuta Sisters is actually a biological sister (Swing Out ​​Sister) Sosuke Sisters is only a half-sister (Gakuen Shimai)  

First Love is 3 Episode OVA with 3 Different Story & 3 Different Couples If you like love between siblings, I recommend you to just watch the first episode of First Love which focus to love story between kasumi & her brother 

Similarity : + Love story between siblings + Sosuke & Kuya Sisters actually is step-sister + Both MC is still green about sex & woman, following main story will tell how both of them learn about that Different : + Sosuke only have 2, Kuya have 6 sisters 

both are involving tennis club, 2 heroine and 1 mc in the beginning