The first time they slept together, it was Gintoki who initiated it. His 'Good Samaritan' deed of the year, if you please.
Soon after the Okita Mitsuba incident Hijikata changed. He became more withdrawn, more tightly wound than usual. When Gintoki stumbled into him at a local bar, he felt it instantly - the dangerous vibe radiating from Hijikata was becoming disturbingly similar to what Takasugi gave off when he got his mean streak. The same appetite for destruction.
And Gintoki knew of only one easy way to, if not satisfy it entirely, then at least keep it in check. Equipped with many years of experience, he wasted no time in getting Hijikata sufficiently drunk and dragging him off to a nearby love hotel.
Fumbling with their clothes in the dark, he kissed and scratched and bit it out of Hijikata, his fury, his pain, frustration, everything. Until they were both left exhausted and empty. Gintoki got out of there at the break of dawn. Waiting for the morning cuddling wasn't really his thing, and neither were the hotel fees, for that matter.
