With Dark and Wilford, teasing is second nature.
Darkiplier is less of a tease sexually, and more just in their every day domestic life. He will tease Wilford with words and play to his personality, knowing that if he teases Wilford about being unable to do something, it's more likely Wilford will go out of his way to prove Dark wrong, instead of saying he'd do the task later, and then forgetting about it.
Wilford is well aware that Dark does this to his advantage, but, when Dark teases him, he gets encouraged to prove himself to his partner and show just how capable he is.
The interactions are mostly teasing, as Dark would never dare to actually attempt to manipulate Wilford. He loves the bubblegum ego too much, and he also knows if he did anything wrong by Wilford, the other would do the same tenfold.
A fight with Wilford is the only fight Darkiplier has no interest in. So Dark just uses his sharp tongue and quick with to keep up with Wilford.
He does, of course, tease Wilford sexually as well, just not as much as the other does.
Dark has always been known for subtleness, like the small little sultry smirk sent Wilford's way when they're in public, or the quick wink that he throws at him. The more subtle, the more it drives Wilford wild, and as soon as they're able, Dark gets thrown onto their bed and ravished, just the way he loves.
Wilford, on the other hand, is the biggest tease known to man, and is relentless with his teasing towards Dark.
...and of course, it's very sexual.
He loves to use touch and words to temp and tease his darling Darkiplier, such as touching him when in public where the other can't do anything in response, like grabbing his ass when they're standing side by side.
The reactions Dark gives are the best, and Wilford revels in it.
With words, Wilford is a bit more discrete, using his powers to speak directly into the back of Dark's mind and seduce him with sultry words and illicit phrases.
His favorite thing to do is wear lingerie under his clothes, and let Dark know what his plans are for the two of them that night in the sanctuary of their bedroom.
When they're in the meeting, surrounded by the other egos, and Wilford is on the other end of the table, looking at Dark like all the other egos.
When he's sure no one else is looking at him, he catches Dark's eye, and lifts his shirt, revealing the lacy silk lingerie that is hidden under his clothes. He throws in a saucy smile and a wink just for kicks, then tucks his shirt back in.
Dark's cheeks turn ten times deeper in shade, and his voice stutters as he chokes up and looks away. He tells the other egos he's fine, then he's back to normal within seconds.
...and when all the other egos leave the room when the meeting is dismissed, Dark throws Wilford down onto the table.