Plowed

Red comes to the countryside for a week of farm work and finds a much easier target than the fields: his own grandmother. The tone is crude and unapologetically taboo, with no attempt to dress up what it's doing.

Hiroshi, the deaf, half-blind grandfather, hands Red the fieldwork and stays oblivious to everything happening under his roof. Yuko, his shy and neglected wife, is the one Red actually came for, and what begins as groping and teasing turns into a full affair as he pushes her further each day her husband doesn't notice.

As a kinetic novel there's nothing to steer; you read through Red's week day by day as the CGs and animated scenes track how far things go. The art has clearly been reworked more than once as the project grew, so later scenes look noticeably cleaner than the earlier ones.