Seraph Ascent Route A (13-18) (Pixiv Fanbox)

Assaulted by the plant's tentacles, Espen is unable to resist as it begins to rapidly drain his energy. Not only is he completely bound and encased within the squishy interior of the plant, but as his energy is drained away, he's forced into a state of exhaustion and eventual submission...

(With Route A complete, next is Route B. From there, the story will continue to progress!)