Dekakute Ecchi na Ore no Ane's excuse of a plot goes as follows: three voluptuous sisters have contracted an illness, which requires them to consume male sperm regularly, or else they die. This preview contains "spoilers" of the first episode, if you can call them that. There's nothing but sex here.
If you can get past the incest thing, this hentai title delivers high quality material for stress relief. Despite the seemingly cute visuals, the contents of Dekakute Ecchi na Ore no Ane are extremely depraved and fetishy.
In the opening sex scene, the male surrogate is surrounded by his nymphomaniac sisters who immediately start stimulating him.
They lick his body, shove their breasts on his face and stroke his cock. After the three sisters tittyfuck their brother together, he unloads on them and watches them gobble up his boyjuice.
The next day, the male surrogate wonders whether yesterday was only a dream, but then notices his half-naked sisters sleeping around his bed. Several boobjob scenes later, we get to real sex. Now, he is alone with only one of his sisters, who has grown dissatisfied with only consuming semen. The sex gets intense, with the brother shooting his load inside her, then immediately resuming with the thrusting. Throughout all this, the voice actress blabbers her lines ceaselessly, but fortunately her voice's so smooth, it adds to the experience instead of detracting from it. The diligent brother pumps his sister's semen-soiled pussy to a new climax, again finishing it inside.
Three more sex scenes follow of similar quality and length. I'm surprised how many scenes the producers were able to fit into only 27 minutes. This is how hentai should be, in my opinion: optimally minimal amount of plot, warmhearted premise, lots of depravity. I have high hopes for the subsequent episodes.
Dekakute Ecchi na Ore no Ane is sold only in Japan, but thankfully, EROBEAT fansubbed the first episode.