数ヶ月かけて。
事前に紫に(理由も言わずに)外へのスキマ繋げてもらって
男を契っては投げ契っては投げ

It'll take several months.
Beforehand, she had Yukari create a gap linked to the outside for her (without telling her what she was going to use it for).
The men are bedded then discarded, bedded then discarded, bedded--...