No use in arguing, you're my wife! -Being pursued by a male 12 years younger

Story :  "You feel that good by my fingers? Turns me on so much." Sensitive inside's being stirred up by a young male... No... Gonna cum...!! Although devoted to her work, Tamaki, a university teacher, is feeling the pressure of marriage before her 32nd birthday. That's when an old student of hers, Itsuki, brings up a promise of marriage from the past!? Can't get married so suddenly! But being pursued strongly by the male who is 12 years younger, it is decided they will do half a year of trial marriage!? Being pushed down without hesitation and roughly licked in an embarrassing area... Body's going to melt...!