After My Female Brother Transformed into a Succubus, She Took Advantage of Me!

Chen Feng has a female brother who grew up as a childhood sweetheart. When he awakened his profession at the age of eighteen and became a Dark Summoner, and when he summoned for the first time, he never thought... He actually summoned to his side the female brother who was admitted to a higher education institution due to early awakening two years ago. "Today is very important. For the succubus, it is a once-in-a-lifetime opportunity to advance." "We have known each other for such a long time, so you have no reason to refuse this small favor, right?" "Be good, be obedient, and leave everything to me." After that, Chen Feng fell in love with the dish of lamb kidneys. ……………… Tears of luck, awakening system. But... "What the hell is the self-sacrifice system?" "You sacrifice hundreds of millions of creatures and get a golden summoning opportunity." "You sacrifice hundreds of millions of creatures to the quadratic power and get a chance to be summoned by a god!" Chen Feng: "I seem to have opened a door to a new world." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.