It took less trouble for Venerable Irene to merge with 'Blinky' than expected.
Part of it was because Ves had already passed through her defenses in the first place. The Time Gate enabled him to observe Irene's perspective from one of her most deepest and intimate parts of herself. There was hardly any better way for him to get any closer to her core!
Aside from that, Venerable Irene was not a particularly distrustful or paranoid individual by nature.
She may be an incredibly smart and experienced god pilot in the far future, but at this moment of time she was only a simple second-class expert pilot in her thirties. She also spent most of her time in the Quillim Mech Army.
Blinky had been quite open and friendly so far. Ves was confident in his charm and he believed he had conveyed enough sincerity to earn Irene's trust. He also wasn't asking for much. He just wanted to take over just enough of her body to perform repairs.