Yes, Issei has an idea!

"... it's risky, but I got an idea that might give us an edge if we confront them at their hideout," Issei finally said. "When we arrive, we'll let everyone else know where it is. And letting those three take on Kokabiel alone's a bad idea itself."

"Then let's hurry, before we lose their trail!" Raynare nodded, grabbing Issei and Koneko, leaving Saji to grab her legs, and she took off, grunting a bit. Issei placed his left hand on her torso as she flew, and transferred his Boosts to her. As well as a currently unused Pawn Piece again.

"That help?" he asked as she picked up speed.

"... actually, yes, thank you!" she nodded, flapping her wings with greater ease. And of course, her currently bare breasts jiggled in enjoyable ways for Issei to admire as they went. His nose was bleeding as he allowed his mind into the gutter during the transport period.

...

Twenty minutes later, they stopped outside a dilapidated church, Kiba, Xenovia and Irina hiding nearby, but being spotted by the others. "Guys," Kiba waved as Raynare landed.

"...jeez, put something on, would you?" Irina flushed, looking away from Raynare, who shrugged.

"It's only some skin, don't be so sensitive," she replied. "Not like there's anyone around to arrest me for public indecency."

"So, do we go in now, or wait for the others?" Kiba asked, a bit of impatience clear in his tone as Issei texted his coordinates to Rias and Sona.

"...they should be here in about thirty minutes," Issei noted as he got a text back. "Their own search groups are meeting up and heading here." He stowed his phone away, and looked towards Irina and Xenovia. "I think we should wait."

"... probably a better idea," Irina nodded. "We were about to storm inside, but unless something changes, waiting for backup is probably a better plan..."

"While we wait, I have something else to help give us an edge," Issei replied, holding his hand out to Irina and Xenovia. "Touch my hand," he requested.

"...if this is a pretense to use that lewd technique of yours on me, then the truce and our old friendship be damned, I will shank you," Irina told him flatly, looking at his hand suspiciously, before touching it.

"Tempting," Issei remarked with a lewd grin. "But no." Once Irina made contact, he transferred another Pawn to her.

"...eh? What is this?" Irina asked, looking at her own hand, feeling the slight power up.

"When I was Reincarnated, Rias needed all eight of her Pawns, but my body couldn't handle all eight of them, so she sealed off all but one in my body at the time. After a good bit of training, I'm now able to utilize five of them for myself. But I also came up with a useful spell to make use of the ones I have, but still can't use myself," Issei explained. "I can transfer the power of a piece temporarily to someone else. I was in part inspired by my Boosted Gear's ability to transfer Boosts for it."

"... interesting... This isn't going to turn me into a Devil, is it?" Irina asked with a bit of mixed awe and trepidation.

"No. If it did, your Excalibur would be burning you right now," Raynare snorted. "It's just the power and abilities, not the piece itself. He's using it on me right now, and I'm still a Fallen. That leaves him one more piece to spare."

Getting the hint, Xenovia also touched Issei's hand, and received the power of the final sealed Pawn. "... interesting. Not much of a boost though..." she noted.

"That's true, Pawns in their base states only give slight increases to all stats... But we're in enemy territory. Once we actually go in, you can Promote them into Queens for a much more significant increase," Saji noted.

"My thoughts exactly," Issei nodded as they settled in to wait.